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. and in that environment, you have then the ejection of alpha, beta and gamma particles. so it's almost simple geometry. right now, this particle we'd call an alpha particle. this is a helium nucleus. and i'll write that helium nucleus like this. and i'll put a two down here and a four here. and this nomenclature, i hope you're familiar with. this is simply the atomic number. it tells you it's atomic number two in the periodic table of substances, yeah? it's got two positive charges. and the four refers to the atomic mass unit. and that's the number of nucleons altogether. i call this, by the way, nucleons. i can call you a people, a person, but a person can be a male or female. nucleon can be a proton or neutron. see what i'm saying? but there's four nucleons altogether, so it has a mass of four and atomic number two. so that would be the configuration. if i put another proton in there, then it would now be-- does anyone know? it would be the element lithium because now it would have three and up here would be five. and any nucleus that has three protons, by definition and by chemical properties, will
substances, or carcinogens. harold varmus: obviously, environment also contributes to function and disease but knowing what genes are inherited by any organism is essential to a full understanding of how they operate and how they misfunction when disease occurs. only five to ten percent of all cancers are thought to be inherited. for instance, women with mothers or sisters who have breast cancer are at increased risk for developing the disease. i'd get it very early, and be very treatable... i wasn't surprised because both my mother and my grandmother had-- my maternal grandmother, had had the same kind of late onset. and i had helped them both through their bouts with it. and so i knew when i saw the irregularity in my breast line what it was, and just moved forward from there. the ucla breast center, a unit of the jonsson cancer center, specializes in treating and counseling women at high risk for breast cancer. experts from a variety of fields work with patients. a nurse practitioner takes the patient's history... a nutritionist with a special interest in breast cancer talks about the r
in their own environment. i feel that when we come back from a home visit, which is usually done in the beginning of the year for the first time, i'm able to understand the parent and the child better. hendrick: many of us, especially those who work with infants, are the child's and the parents' first real contact with the outside world. this presents us with a unique opportunity for becoming closely involved and attached to our infants and family members. hi. hi. but how do we form a bond with our children without becoming overly attached? where do we begin? we can start by making sure the lines of communication between ourselves and the family members are wide open. he has not eaten this morning. he was a good little boy, even though his sister woke him up. sissy wake you up? yes, she did. did sissy wake you up this morning? he's probably hungry. are you hungry? hendrick: one way is by looking for opportunities to find out what's happening at home. families are under a great deal of stress these days for any number of reasons. they might regret having to leave their child with
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